sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs), Color: Deep red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Deep red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or volcanic ash, occurring in sedimentary environments where iron oxides permeate the quartz matrix during crystallization.
Uses & applications
Primarily used as a gemstone for jewelry, decorative carvings, lapidary arts, and as a popular specimen for collectors interested in metaphysical properties.
Geological facts
Iron is the element responsible for its vibrant red color. Ancient Egyptians used Red Jasper in amulets to enhance strength and protection. It is classified as an opaque variety of chalcedony.
Field identification & locations
Identify by its deep red opaque color and smooth, waxy feel when polished. It cannot be scratched by a steel knife. Commonly found in Brazil, India, USA, and South Africa.
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